Effects of replacing extruded wheat flour with extruded oak acorn flour on growth, enzyme activity and diet digestibility in common carp (Cyprinus carpio)

Document Type : scientific research article

Authors

1 . Corresponding Author, Dept. of Fisheries, Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran

2 Dept. of Fisheries, Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology, Behbahan, Iran.

Abstract

Oak acorn is widely used in livestock feeding due to its low price but in order to use it in the diet of aquatic animals, it is necessary to study the effect of the feed manufacturing process on its usability. Four diets containing: 1) 17% extruded wheat flour, 2) 5% non-extruded wheat flour and 12% extruded wheat flour, 3) 5% non-extruded oak acorn flour and 12% extruded wheat flour, and 4) 5% of extruded oak acorn flour and 12% of extruded wheat flour were evaluated in a completely randomized design with three replicates for each treatment. The fish were reared in round plastic tanks with a volume of 250 liters and a density of 15 fish with an average initial weight of 5.42 ± 0.03 g in each tank. After 8 weeks, the highest weight and total length of fish were observed in treatment 4, so that there was a significant difference with treatment 3 (P<0.05). The amount of protein in the enzyme extract of treatment 1 was significantly higher than other treatments (P<0.05). The highest protease activity was observed in treatment 2, which was significantly different from treatment 3 (P<0.05). Protein digestibility in treatment 2 was significantly higher than other treatments (P<0.05). Significantly, the highest amylase activity was observed in treatment 2 and the lowest carbohydrate digestibility was recorded in treatment 3 (P<0.05). Based on growth indicators, digestive enzyme activity and protein and carbohydrate digestibility, it is recommended to consume oak acorn flour at the level of 5% of common carp extruded diet.

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